/*
    SPDX-FileCopyrightText: 2014-2015 Christian Dávid <christian-david@web.de>
    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "nationalaccountdelegate.h"

#include <QApplication>
#include <QPainter>
#include <QAbstractItemView>

#include <KLocalizedString>

#include "models/payeeidentifiercontainermodel.h"
#include "nationalaccountedit.h"

nationalAccountDelegate::nationalAccountDelegate(QObject* parent, const QVariantList&)
    : QStyledItemDelegate(parent)
{

}

/** @todo elide texts */
void nationalAccountDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);

    // Background
    QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
    style->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, painter, opt.widget);

    const int margin = style->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1;
    const QRect textArea = QRect(opt.rect.x() + margin, opt.rect.y() + margin, opt.rect.width() - 2 * margin, opt.rect.height() - 2 * margin);

    // Do not paint text if the edit widget is shown
    const QAbstractItemView *view = qobject_cast<const QAbstractItemView *>(opt.widget);
    if (view && view->indexWidget(index))
        return;

    // Get data
    payeeIdentifierTyped<payeeIdentifiers::nationalAccount> ident = identByIndex(index);

    // Paint bank code
    painter->save();
    const QFont smallFont = painter->font();
    const QFontMetrics metrics(opt.font);
    const QFontMetrics smallMetrics(smallFont);
    const QRect bicRect = style->alignedRect(opt.direction, Qt::AlignTop, QSize(textArea.width(), smallMetrics.lineSpacing()),
                          QRect(textArea.left(), metrics.lineSpacing() + textArea.top(), textArea.width(), smallMetrics.lineSpacing())
                                            );
    painter->setFont(smallFont);
    style->drawItemText(painter, bicRect, Qt::AlignBottom, QApplication::palette(), true, ident->bankCode(), opt.state & QStyle::State_Selected ? QPalette::HighlightedText : QPalette::Text);
    painter->restore();

    // Paint bank name
    painter->save();
    const QRect nameRect = style->alignedRect(opt.direction, Qt::AlignTop, QSize(textArea.width(), smallMetrics.lineSpacing()),
                           QRect(textArea.left(), metrics.lineSpacing() + smallMetrics.lineSpacing() + textArea.top(), textArea.width(), smallMetrics.lineSpacing())
                                             );
    style->drawItemText(painter, nameRect, Qt::AlignBottom, QApplication::palette(), true, ident->bankName(), opt.state & QStyle::State_Selected ? QPalette::HighlightedText : QPalette::Text);
    painter->restore();

    // Paint account number
    painter->save();
    QFont normal = painter->font();
    normal.setBold(true);
    painter->setFont(normal);
    const QRect ibanRect = style->alignedRect(opt.direction, Qt::AlignTop, QSize(textArea.width(), metrics.lineSpacing()), textArea);
    style->drawItemText(painter, ibanRect, Qt::AlignTop, QApplication::palette(), true, ident->accountNumber(), opt.state & QStyle::State_Selected ? QPalette::HighlightedText : QPalette::Text);
    painter->restore();

    // Paint type
    painter->save();
    QRect typeRect = style->alignedRect(opt.direction, Qt::AlignTop | Qt::AlignRight, QSize(textArea.width() / 5, metrics.lineSpacing()), textArea);
    style->drawItemText(painter, typeRect, Qt::AlignTop | Qt::AlignRight, QApplication::palette(), true, i18n("National Account"), opt.state & QStyle::State_Selected ? QPalette::HighlightedText : QPalette::Text);
    painter->restore();
}

QSize nationalAccountDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);

    // QStyle::State_Editing is never set (seems to be a bug in Qt)! This code is here only because it was written already
    const QAbstractItemView *view = qobject_cast<const QAbstractItemView *>(opt.widget);
    if (view && view->indexWidget(index))
        return view->indexWidget(index)->sizeHint();

    QFontMetrics metrics(option.font);
    const QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
    const int margin = style->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1;

    // An iban has maximal 32 characters, so national accounts should be shorter than 28
    return QSize((28)*metrics.width(QLatin1Char('X')) + 2*margin, 3*metrics.lineSpacing() + metrics.leading() + 2*margin);
}

QWidget* nationalAccountDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    Q_UNUSED(option);
    nationalAccountEdit* edit = new nationalAccountEdit(parent);
    connect(edit, &nationalAccountEdit::commitData, this, &nationalAccountDelegate::commitData);
    connect(edit, &nationalAccountEdit::closeEditor, this, [&](QWidget* editor) {
        emit const_cast<nationalAccountDelegate*>(this)->closeEditor(editor);
    } );
    emit sizeHintChanged(index);
    return edit;
}

void nationalAccountDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
    nationalAccountEdit* nationalEditor = qobject_cast< nationalAccountEdit* >(editor);
    Q_CHECK_PTR(nationalEditor);

    nationalEditor->setIdentifier(identByIndex(index));
}

void nationalAccountDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
{
    Q_CHECK_PTR(editor);
    Q_CHECK_PTR(model);
    Q_ASSERT(index.isValid());

    nationalAccountEdit* nationalEditor = qobject_cast< nationalAccountEdit* >(editor);
    Q_CHECK_PTR(nationalEditor);

    payeeIdentifierTyped<payeeIdentifiers::nationalAccount> ident = identByIndex(index);
    ident->setAccountNumber(nationalEditor->accountNumber());
    ident->setBankCode(nationalEditor->institutionCode());
    model->setData(index, QVariant::fromValue<payeeIdentifier>(ident), payeeIdentifierContainerModel::payeeIdentifier);
}

void nationalAccountDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    Q_UNUSED(index);
    editor->setGeometry(option.rect);
}

/**
 * Internal helper to directly convert the QVariant into the correct pointer type.
 */
payeeIdentifierTyped<payeeIdentifiers::nationalAccount> nationalAccountDelegate::identByIndex(const QModelIndex& index) const
{
    payeeIdentifierTyped<payeeIdentifiers::nationalAccount> ident = payeeIdentifierTyped<payeeIdentifiers::nationalAccount>(
                index.model()->data(index, payeeIdentifierContainerModel::payeeIdentifier).value<payeeIdentifier>()
            );

    Q_ASSERT(!ident.isNull());
    return ident;
}
